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Geology of the Grand Canyon: The Jurassic.

THE CRETACEOUS.THE TRIAS.THE JURASSIC.Beyond the Cretaceous, as we descend the stairway of terraces, the Jurassic comes to daylight. It forms a belt encircling the Cretaceous and outside of…

Geology of the Grand Canyon: De Motte Park.

DE MOTTE PARK.Its length is about ten miles, its average width about two miles. It is a depressed area in the heart of the plateau and is on every side girt about by more elevated ground…